Apparatus for molding glass



Sept. 1, 1964 R. B. ABBOTT ETAL APPARATUS FOR MOLDING GLASS 9Sheets-Sheet 1 Original Filed July 25, 1957 Far 4 f filmy- ATTORNEYSSept. 1, 1964 R. B. ABBOTT ETAL 3,147,105

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APPARATUS FOR MOLDING GLASS Original Filed July 25, 1957 9 Sheets-Sheet3 KILL Sept. 1, 1964 R. B. ABBOTT ETAL ,1

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' APPARATUS FOR MOLDING GLASS Original Filed July 25, 1957 9Sheets-Sheet 6 ATTORNEYS Sept. 1, 1964 R. B. ABBOTT ETAL APPARATUS FORMOLDING GLASS 9 Sheets-Sheet 7 Original Filed July 25, 1957 INVENTORS21mm, 8'958677 B ?9 PM KSQ' ATTORNEYS Sept. 1, 1964 R. B. ABBOTT ETAL3,147,105

APPARATUS FOR MOLDING GLASS Original Filed July 25, 1957 9 Sheets-Sheet8 INVENTORS aw/Mu: @5077 ATTORNEYS Sept. 1, 1964 R. B. ABBOTT ETALAPPARATUS FOR MOLDING GLASS.

9 Sheets-Sheet 9 Original Filed July 25, 1957 5 W W la ATTORNEY UnitedStates Patent 3,147,105 APPARATUS FOR MOLDING GLASS Raymond B. Abbott,Toledo, Ohio, and Ralph H. Olson, Geneva, Switzerland, assignors toOwens-Illinois Glass Company, a corporation of Ohio Original applicationJuly 25, 1957, Ser. No. 674,149, now Patent No. 3,024,571, dated Mar.13, 1962. Divided and this application Aug. 14, 1961, Ser. No. 131,260

2 Claims. (Cl. 65-361) Our invention relates to the molding of moltenglass into hollow shaped articles and in particular relates to thepressing and blowing method of producing glass articles.

This application is a divisional of our copending application Serial No.674,149, filed July 25, 1957, now Patent No. 3,024,571.

The glass industry has recognized the troubles inherent in the operationof two-piece, open and shut molds since the advent of the automaticmachine. In such molds the matching seams are difficult to maintain,both in the mold equipment and the machine parts which carry the molds.Further, such matching surfaces form a material heat barrier or blockand presents an uneven heat or temperature unbalance which is imposibleto overcome.

On the well-known IS machine, these troubles have compounded themselvesin recent years. With the application of the well-known 62 process(Rowe, 2,289,- 046) to said machine and the trend to lightweight wareand higher speeds, these problems have been further increased.

In order to offset these difiiculties this present inventioncontemplates the provision of a new type of parison mold.

In essence this apparatus concerns the press molding of a parison orblank of molten glass, either singly or in pairs, and the use of aninverted seamless blank mold for forming same. Additionally, there isthe usual blow molds positioned at a blowing station and an apparatusfor transferring the shaped parisons from the blank forming station tothe blowing station.

In the usual stationary section machines such as disclosed in the patentto Ingle, No. 1,911,119, the parisons are formed inverted, but theirformation is accomplished by the usual blow and blow method rather thanby the press and blow method. This present apparatus contemplatesforrning parisons in the inverted position by a press method andreverting these parisons during the transfer to the blow mold.

An object of the invention is the provision of a new type of seamlessparison mold and a novel mounting therefor.

A further object is the provision of apparatus for reducing vibration ofmoving parts in a high speed operation.

Other objects will be in part apparent and in part pointed outhereinafter.

In the drawings:

FIG. 1 is an elevational view illustrating the mold arrangement andrelationship of this forming machine;

FIG. 2 is a sectional elevation taken at line 22 on FIG. 4 through theblank mold head illustrating the plural blank mold structure and coolingdevices;

FIG. 3 is a sectional plan view taken at line 3-3 on FIG. 2 whichillustrates the mold wall structure with its cooling channels;

FIG. 4 is a plan view of the blank, neck and blow molds takenapproximately at line 44 on FIG. 1;

FIG. 5 is a sectional view taken at line 55 on FIG. 1 and illustratesthe neck mold fluid pressure closing mechanism;

FIG. 6 is a part sectional elevation of the blank mold raising andswinging device illustrating both the control 3,147,105 Patented Sept.1, 1964 of the swing of the blank mold and its holder and the coolingair channels therefor;

FIG. 7 is an elevational view of the lower end of the blank moldraising, lowering, and swinging mechanism;

FIG. 8 is a part sectional plan view of the blank mold and its holder;

FIG. 9 is a plan view of the blank mold holder illustrating its assemblystructure;

FIG. 10 is a section taken at line 10-40 on FIG. 5 and illustrates theconduits for providing auxiliary pressure for closing the neck molds;

FIG. 11 is an elevational view of the blank mold holder structure;

FIG. 12 is a fluid piping diagram for the apparatus;

FIG. 13 is a plan view of the snubber structure for the parison mold;

FIG. 14 is an elevational view of the snubber structure;

FIG. 15 is an enlarged, part sectional view of the snubber of FIG. 13;

FIG. 16 is a partial section taken at line 19-19 on FIG. 15;

FIG. 17 is a sectional view taken at line 2020 on FIG. 16;

FIG. 18 is a section taken at line 21--21 on FIG. 15.

A glassworking machine embodying the present invention is illustrated asbeing a machine wherein each unit or section embodies a movable annularblank mold, a stationary partible blow mold, and a split neck moldadapted to cooperate alternately with the said blank mold and blow moldto transfer a blank or parison from the blank mold to the blow mold; agob delivery mechanism B for successively supplying charges to eachforming section; and a pressure control mechanism C for adjustablyregulating the application of actuating fluid pressure to the severaloperating portions of said forming section, in proper sequence and intimed relation to each other and the gob feeding device.

This forming section may be provided as one of a series of unitsarranged either singly, in a straight line beneath the feeder orifice ordisposed in some other arrangement about the vertical center line of thefeeder orifice or in any desired geometric pattern. In addition theseglass forming units may also be arranged upon a table for rotarymovement beneath the gob feeder. With particular reference to FIG. 1,the forming section embodies an annular blank mold unit 10 which remainspermanently in inverted position, but which is movable into and out of aparison forming position.

In this present disclosure the drawings illustrate a plural mold cavitystructure, but of course the invention is applicable to a single moldstructure.

A blow mold unit 12 of the split mold type is permanently disposed inneck-up position at the final blowing station, and a split neck ring 15is adapted to swing about a horizontal axis from the blank or parisonforming station to transfer and invert a parison into upright blowingposition at the blow mold station for final blowing into a completedarticle. The mold units 10 and 12 and the neck ring holder 15a aresupported upon a platform 20 which in turn is connected to and supportedby upright frame structures 21 mounted upon a base 22. These frames 21are interconected at their upper ends by a channel member 25. Eachparison mold unit is comprised of a pair of annular unsplit shapingmolds 30 mounted in a hollow holder 31 which is in turn mounted upon andattached to a vertical shaft 32. The hollow holder 31 is formed at oneend in a hollow sleeve portion 35 having inner support bearings 36 and37 attached to shaft 32. The sleeve portion 35 is adapted for telescopicmovement in a hollow member 40 and thus provides a continuous conduitfor cooling air from a source of supply (not shown) through channels 41,42, and 43, to and around the molds (FIGS. 1 and 8) for the cooling ortemperature control thereof. This blank mold supporting member is of aspecific structure which will be described in detail later on in thisdescription.

The blank molds 30 and their support 31 are adapted for both verticaland horizontal motion, with the shaft 32, to bring them to the operativeforming position and then to an inoperative position above and to oneside of the operative position. The upper end of shaft 32 has mountedthereon and attached thereto a bracket which carries in its outer end apivot block 52 pivoted at 53 on said bracket 50. The pivot block 52 isadapted for vertical sliding movement in slide block 55.

A support bracket 60, formed as an extension of the vertical hollowmember 40, provides a supporting base 61 upon which is mounted a cushioncontrol block 65. The slide block is mounted on and attached to avertical pivot shaft 70 which in turn is mounted in the control block65. This mounting permits the slide block 55 to pivot with shaft 70 forthe following purpose.

The blank molds 30 are required to lift and swing about shaft 32 withgreat rapidity and in order to avoid the detrimental effects of thesuccessive rapid starting and stopping of the swing of the molds an oilcushion control 65 has been provided which operates as a torquedampening means. The shaft has formed thereon a shoulder having formedin the opposite sides thereof extended ports 81 and 82. These ports areof equal dimension and are interconnected by a channel 83. Each port 81and 82 is arranged to alternately register with channel 85 and 86respectively formed in a stationary plate 88 locked to the control box65 by screws 89 as shown in FIG. 17. A bafile blade 91 is attached tothe rotary shoulder 80 of shaft 70 and oscillates with said shaft 70.

Check valves 93 and 94 are formed to cooperate with ports 85 and 86respectively to control the flow of oil to and from chambers 96 and 97,formed between the blade 91 and plate 88, such flow from ports 85 and 86being due to movement of blade 91. Channels 101 and 102 lead fromchambers 96 and 97 respectively to bleeder needle valves 105 and 106respectively.

An additional oil channel 110 interconnects channels 101 and 102 and hasa check valve 112 therein which causes the exhaust oil from chamber 97to pass through needle valve 106 to thus provide an oil cushion againstwhich the blade 91 will work to cushion the swing of the mold holder 31when the molds 30 are removed from their forming position. After passingneedle valve 106, the oil then passes through conduit 106a into channel115, check valve 116, channels 115a, 115b and 101 then into chamber 96.

The channel 110 also interconnects channels 101 and 102 and is adaptedto control, through the restriction provided by check valve 116, theexhaust of oil from behind blade 91 in chamber 96 to cushion the swingof the molds 30 when they are moving to their operative position. Thusthe oil will flow from chamber 96 through channels 101, needle valve105, channels 110 and 102, into chamber 97. This structure permits oilto be freely sucked into the chambers 96 and 97 on one stroke and to becontrolled in its rate of exhaustion as it is freed from said chamberson the opposite stroke. Oil is provided to this control block 65 throughchannel 117 and locked therein by plug 118.

Through the above mechanisms the mold support 31 with its molds 30 maybe successively swung to and from its operative position to theinoperative position at very high speeds without detrimental vibration.The swinging, raising and lowering of the blank mold support 31 and theblank mold 30 is accomplished through a cylin der 125, a piston 126attached to the piston shaft 32, a cam roll 127 formed on the lower endof shaft 32 and a control cam 128 formed in the cylinder head 128aattached to the lower end of cylinder 125. The cylinder is mounted andretained on the base 22 by the bolts 129 (FIGS. 1 and 8). Suitableactuating pressure is supplied to cylinder 125 through pipes and 136 toraise, lower and swing support 31 with its molds 30.

The upper end of piston shaft 32 extends upwardly through the telescopicmember 35 and bearing 36a of conduit 40 and is then attached to theswing cushion control 65 through lever 50. This particular controlmechanism has been previously described above.

The lower end of piston shaft 32 extends through and is slidably mountedin the cylinder head 128a formed as a part of cylinder 125.

As the piston 32 moves from the position shown in FIG. 8, under theinfluence of pressure supplied through pipe 136, to raise and swing theblank molds 30, the cam 128 acting on cam roll 127 permits the moldsupport 31 and molds 30 to first move straight up until the curvedsection 130 causes the shaft 32 to rotate and swing the mold support 31laterally out of the path of the oscillating neck rings 15, theconstruction and operation of which will be hereinafter described. Asthe shaft 32 rotates, its connection with the cushion control 65 isactuated to cushion the end of the rotation and prevent vibration ofthese mold parts. When the piston stroke is reversed the molds 30 andsupport 31 swing into operative position over and in register with theneck molds 15.

During the charging of the blank molds 30 at the parison formingstation, the neck molds 15 occupy a position beneath and in registeredcontact with the blank molds 30. This registration is obtained andmaintained by the mating angular surface areas 140 (FIG. 2) so that eachblank mold 30 accommodates itself to the position of its respective neckring 15. The neck molds 15 are of the split type and the halves thereofare carried upon support arms and 159. These neck molds 15 are somounted upon their respective supports as to have little if any,horizontal or sliding motion thereon. The blank molds 30 are movable inany direction with respect to their support 31. Reference to FIG. 2 willshow that the blank molds 30 can move horizontally with respect tosupport 31 due to the clearance provided at 31a and 31b. Guide plates31c and 31d attached to the top end of support 31 retain the molds 30 inthe support but permit limited relative movement therebetween in boththe vertical and horizontal planes as will be more fully disclosedhereinafter.

Formation of parisons in this present mechanism is accomplished by thewell-known press method. The charges of glass being provided by theusual glass feeding device and directed to the parison molds 30 throughgob chutes 252 and 252a adapted to guide the charges to and through theopen upper ends of the blank molds 30. Concurrent therewith, butfollowing the charging of the molds, baffie plates 152, mounted on anarm 154, are swung about shaft 156, through activation provided bycylinder 157 and cam 167 and brought into registration with and seatedupon the molds 30.

The pressing of the gobs of molten glass to form blanks or parisons isobtained through a vertical, fluid pressure twin cylinder unit (FIG. 2)mounted upon the base 22, below and in alignment with the blank and neckmolds 30 and 15 respectively, at the charging position of the machine.When the blank molds 30 are in forming position, as shown in FIGS. 1, 4and 12, the open upper end thereof is adapted to be closed by a cover orbaflle plate 152 which is shaped to fit within complementary depressions153, formed in the upper end of the blank molds 30. The baffie plates152 are provided with internal cavities 153a into and through whichcooling fluid may be passed.

The arm 154 which supports the baffles 152, is secured to the lower endof a vertically reciprocable piston rod 156, which extends upwardlythrough a fluid pressure cylinder 157 and is provided with a piston 158(FIG. 2). The cylinder 157 is suitably mounted on the cross channel 25and is supplied with valve controlled fluid under pressure through pipes160 and 161, in order to raise and lower the bafiles or cover plates 152with respect to the blank molds 30.

The upper portion of the piston rod 156 extends through and is slidablymounted in an upper cylinder head 163, formed with an upwardly extendingcam sleeve 165. This sleeve functions as a protective housing for thetop portion of the piston rod 156, and is provided with a helical slot167 into which projects a cam pin 169 carried by the piston rod 156. Asthe piston moves upwardly, under the pressure admitted through pipe 161,to elevate the mold bafiles 152, the cam slot 167, acting on the pin169, imparts a partial rotation to the rod 156 which is sufiicient toswing the baflles 152 in a lateral direction and out of the path of theoscillating neck rings 15. Upon the downward stroke of piston 158, thebaifies 152 will return to closing position in cooperation with theblank molds 30.

During the mold charging and blank forming operations, the neck rings 15occupy a position beneath and in alignment with the blank molds 30(FIGS. 1, 2, and 5) and are provided on their upper ends with an angularsurface area 140 which is adapted to cooperate with complementaryrecesses in the lower ends of the blank molds 30, thereby maintaining anexact registration between the neck rings 15 and blank molds 30 duringthe blank forming operations.

The neck mold inverting mechanism is shown in FIGS. 1, 4 and 5. Thismechanism is comprised of a pair of support arms 155 and 159 fulcrumedon a shaft 220 mounted in bearings 221a formed on hearing bracket 221.The bearings 221:: support the shaft 220 in a horizontal position. Theshaft 229 is provided with an enlarged portion 223, upon which ismounted a pair of sleeves 224- and 224a, each sleeve adapted for bothrotary motion with and sliding movement along the length of shaft 220.Each sleeve is provided with a slideway 225 and 225a formed thereon insuch a manner that when the neck molds are in either of their twooperative positions, these slideways will be disposed in a verticalplane. The arms 155 and 159 are also provided with slide formations 152aand 153a adapted to cooperate with the slideway portions 225 and 225a ofthe sleeves 224 and 224a. This slide and slideway structure will permitthe neck rings 15 to be adjusted vertically at either of the operativepositions to bring the neck rings 15 into proper cooperative verticalposition with respect to either the tapered formation 2115 on the upperend of the plunger cylinder sleeve 201) or into proper vertical positionwith respect to the top surface of the blow molds 12. The rotation ofthe neck mold arms 155 and 159 about the axis of shaft 220 to transferthe parisons from their forming station to the blowing station isaccomplished through a pinion 230 and a vertically disposed pinion rack231 positioned in meshing contact with the pinion 230'. The rack 231 isformed on the upper end portion of a piston rod 232, attached to apiston 233 and adapted for vertical movement in a cylinder 234. Airinlet pipes 235 and 235a are adapted to permit pressure air, under valvecontrol, to enter the cylinder 234 at the bottom and top ends thereofrespectively.

Continuous pressure air is supplied from conduit 239 to channels 239a,239b, 239a, and 239d into chambers 219 and 219a when the neck mold arms155 and 159 are in the position shown in FIGS. 5 and 6 to insure holdingthe neck rings 15 closed against the glass pressing pressure. After thepressing operation is completed and the transfer of the parison is inprogress, this air pressure may be and generally is continued through atleast a portion of the transfer movement for cooling purposes.

When the neck molds 15 carying the parisons, are rotated and reach theblowing station, it then becomes necessary to open these neck rings 15and release the parisons to the control of the blow molds 12. Thisopening of the neck rings releases the parison to the 6 confines of theblow mold 12 which has been closed just prior to the release of theparison. The piston 233 of the transfer cylinder 234 is then subjectedto air under pressure admitted through pipe 235a to return the neckrings 15 to the parison forming position. During this returning motion,the pressure in chamber 243 and 2430. will be released, the springs 237and 237a will then cause the neck rings to close.

In order that high speed production may be obtained and maintained itis, of course, necessary that the several molds be cooled during theforming operation and in particular the neck rings 15 should be cooledduring the molding operation because with this particular mechanism, theglass forming molds are being utilized at exceptionally high speeds. Forexample, at speeds approximately four times faster than is normallyaccomplished with similar mechanisms.

The hollow mold support member 31 (FIG. 2) is adapted to support one ormore annular blank molds 3t) and in this present instance, two blankmolds are shown. Each single piece annular parison mold 330 is provided,at its upper end, with a pair of grooves 31a and 31b into which arefitted opposed thin semi-circular rings 31c and 31d. These split ringsare retained in their operative positions by means of a series ofretaining pins 31s and 312. The width of the grooves 31a and 31b isgreater than that of the rings 31c and 31d and the vertical spacingbetween the grooves is greater than the thickness of the top surface ofthe mold holder 31. The vertical spacing between the rings 31c and 31dand the lower shoulder 30a of each mold 30 is greater than the height ofthe mold holder 31. These excess dimensions thus permit the molds 3% tohave limited freedom of vertical movement with respect to the holder 31when or at the time molds 30 are seated upon the neck molds 15.

When the neck rings 15 are actuated, as heretofore described, totransfer the formed parisons to the finish blowing station, the parisonsare deposited in the open blow mold 12 in a neck-up position. The blowmold 12 (FIGS. 1 and 4) in the present instance, is at a fixed stationand comprises two cooperating sections 255 which are detachably securedto mold holders 256. The mold holders are hinged upon a pin 257 which iscarried by housing 258 having trunnions 259 provided at each endthereof, and which are secured to the side frame elements 260.

The blow mold halves 255 open and close at proper times by means offluid pressure which is admitted to a vertically disposed cylinder 261(FIG. 1) through pipes 262 and 263. These pipes lead respectively fromvalves by means of which the flow of pressure delivered to the cylinder261 may be regulated as desired. The cylinder is mounted on the base 20of the machine and is provided with a piston 26% which is carried by apiston rod 269. The piston rod 269 extends entirely through and isslidably mounted in both of the heads of the cylinder 261 and isprovided at its upper end with a rack bar 272. This rack bar is slidablymounted in the housing 273 and meshes with a spur gear 275 which isfixed to a horizontal shaft 276. The shaft 276 is provided with spiralgears 278, which mesh with spiral gears connected to drive a crankconnected to the blow mold holders 256 by means of links 236 (FIG. 4)and together form a toggle to lock the mold sections in a closedposition during the blowing operation.

The lower portion of the blow mold is closed by bottom plates 29%) whichare supported by a holder 291. This holder is adjustably mounted on asupport 292 carried by the base 22 of the machine. The bottom plate 299may be adjusted vertically with respect to the blow mold by looseningthe clamp 293.

The upper portion of the blow mold is adapted to be closed by blow heads294, which are detachably secured to a hollow arm 295 by any suitableconnection, such as a bayonet joint connection.

In FIG. 1, the blow head 295 is shown as contacting the top of the blowmold 12 during the finish blowing operation, the neck ring 15 havingbeen returned to the blank forming station. By this arrangement, theblowing operation may overlap the succeeding blank forming operation,thus permitting the ware to remain in the blow mold for relativelylonger interval of time.

The fluid pressure control mechanism C as shown in FIG. 12 isapproximately the same as that shown in the Ingle patent, No. 1,911,119,previously mentioned.

In the operation of the apparatus described above, mold charges ofmolten glass are delivered by a feeder through the funnel 252:: and arereceived in succession by the trough sections 252 and delivered into theblank molds 30. The machine then proceeds through the control providedby a timing cam drum to fabricate the mold charges which it receives,first by applying a pressing action to the glass in the combined neckand blank molds 15 and 30, then stripping the blank mold, and swingingthe bare parison by the neck rings 15 to an upright position at thefinish blowing station during which time the parisons are permitted toreheat, then closing the blow mold 12 and finish blowing the ware, andfinally opening the blow mold 12 to release the ware.

The cycles of operation may be so arranged that the blow molds areactive almost continuously. That is to say, the ware may be taken out ofeach blow mold immediately before fresh parisons are delivered theretoby the neck rings. The parison mold may be kept in operation almostcontinuously because the cooling of the neck rings 15 and parison molds39 is a continuous operation, and as soon as the parisons aretransferred to the blow mold 12 and the neck rings 15 returned to theblank forming station, the blank molds 30 are then in a te. peraturecondition to immediately receive another charge for the pressing ofsucceeding parisons for subsequent transfer to the blow mold 12 duringthe time that the parisons previously formed in the same blank molds arebeing blown to final form in the associated blow mold 12. When theparisons are formed, the blank mold is stripped from the parisons,leaving the bare parisons supported in inverted position by the neckrings 15.

The stripping movements of the parison molds 30 are concurrent with thetransfer movements of the neck molds 15. For example, as the mold holder31 and molds 30 move directly, vertically upward away from the invertedshaped parisons, they move in a straight vertical line for a certaindistance and then swing horizontally while continuing the verticalmovement. of completion of the horizontal swing of the blank molds 30 orjust slightly before, the neck molds 15 start to swing upwardly andaround the fulcrum shaft 220 to the blow mold position. At this pointthe blow mold 12 closes about the parisons, the neck rings 15 open andswing back to the press position and the parison molds 30 swing downupon and in register with the neck rings 15. During the precedingoperations both the neck molds and the parison molds are being cooled.

This practically continuous operation of the blank and blow moldsrenders it possible to press the parisons in the blank molds during thetime that the parisons previously pressed in the same blank molds arebeing blown to final form in the associated blow mold and because thesemolds 15 and 30 are designed for high speed cooling and are efficientlyand continuously cooled in a ver- At the instant 8 tically spaced typeof zonal cooling they may be successively and rapidly used for formingparisons at extremely high speeds.

From the foregoing it will be apparent that a relatively simple moldingsystem has been devised and utilized.

Modifications may be resorted to within the spirit and scope of theappended claims.

We claim:

1. The combination of a glass forming mold, a mold holder supporting themold, a vertical shaft mounted for vertical and oscillatory movement andconnected to said mold holder, power means connected to said shaft forraising and lowering the shaft, cam means associated with said shaft foroscillating the shaft in response to a portion of its vertical movement,said power means and said cam means together moving the shaping moldbetween an operative forming position and a remote inoperative positionabove and out of axial alignment with the operative position of themold, a pivot block attached to said shaft for movement with the shaft,said block being axially spaced on said shaft beyond the axial travel ofsaid mold, a torque dampening means, said torque dampening meanscomprising an oscillatable blade fixed to a second shaft and disposed ina cushion chamber containing a fluid together with means for controllingflow of fluid to and from said chamber, said flow controlling meansincluding passage means in said second shaft and said cushion chamberproviding communication between opposite sides of said blade, flowrestricting means in said passage means for retarding flow of fluid fromsaid chamber, a slide block attached to said second shaft, said pivotblock being in sliding engagement with said slide block, oscillation ofsaid pivot block effecting oscillation of said second shaft and theslide block, the flow restricting means cushioning rapid swingingmovements of said mold holder and the mold thereon to insure accuratepositioning of the mold in the operative forming position and preventdetrimental vibration of the mechanism.

2. The combination defined in claim 1, wherein the shaft of the torquedampening means is vertical and the torque dampening-means comprises astationary housing supporting the shaft for rotation, an annular chamberin said housing, a blade member attached to said shaft and housed insaid chamber for annular movement therein by said shaft, channel meansin said housing connecting the opposite ends of said chamber on theopposite sides of said blade member, the said chamber and channel meanscontaining a fluid, and adjustable throttle valve means operativelyconnected in said channel means for restricting the flow of fluid fromthe chamber at one side of the blade member into the chamber at theother side of said blade member, the fluid flow dampening the rotationalmovements of the blade member and said shaft.

References Cited in the tile of this patent UNITED STATES PATENTS Gieset a1 Jan. 30,

1. THE COMBINATION OF A GLASS FORMING MOLD, A MOLD HOLDER SUPPORTING THEMOLD, A VERTICAL SHAFT MOUNTED FOR VERTICAL AND OSCILLATORY MOVEMENT ANDCONNECTED TO SAID MOLD HOLDER, POWER MEANS CONNECTED TO SAID SHAFT FORRAISING AND LOWERING THE SHAFT, CAM MEANS ASSOCIATED WITH SAID SHAFT FOROSCILLATING THE SHAFT IN RESPONSE TO A PORTION OF ITS VERTICAL MOVEMENT,SAID POWER MEANS AND SAID CAM MEANS TOGETHER MOVING THE SHAPING MOLDBETWEEN AN OPERATIVE FORMING POSITION AND A REMOTE INOPERATIVE POSITIONABOVE AND OUT AF AXIAL ALIGNMENT WITH THE OPERATIVE POSITION OF THEMOLD, A PIVOT BLOCK ATTACHED TO SAID SHAFT FOR MOVEMENT WITH THE SHAFT,SAID BLOCK BEING AXIALLY SPACED ON SAID SHAFT BEYOND THE AXIAL TRAVEL OFSAID MOLD, A TORQUE DAMPENING MEANS, SAID TORQUE DAMPENING MEANSCOMPRISING AN OSCILLATABLE BLADE FIXED TO A SECOND SHAFT AND DISPOSED INA CUSHION CHAMBER CONTAINING A FLUID TOGETHER WITH MEANS FOR CONTROLLINGFLOW OF FLUID TO AND FROM SAID CHAMBER, SAID FLOW CONTORLLING MEANSINCLUDING PASSAAGE MEANS IN SAID SECOND SHAFT AND SAID CUSHION CHAMBERPROVIDING COMMUNICATION BETWEEN OPPOSITE SIDES OF SAID BLADE, FLOWRESTRICTING MEANS IN SAID PASSAGE MEANS FOR RETARDING FLOW OF FLUID FROMSAID CHAMBER, A SLIDE BLOCK ATTACHED TO SAID SECOND SHAFT, SAID PIVOTBLOCK BEING IN SLIDING ENGAGEMENT WITH SAID SLIDE BLOCK, OSCILLATION OFSAID PIVOT BLOCK, THE OSCILLATION OF SAID SECOND SHAFT AND THESLIDE-BLOCK, THE FLOW RESTRICTING MEANS CUSHIONING RAPID SWINGINGMOVEMENTS OF SAID MOLD HOLDER AND THE MOLD THEREON TO INSURE ACCURATEPOSITIONING OF THE MOLD IN THE OPERATIVE FORMING POSITION AND PREVENTINGDETRIMENTAL VIBRATION OF THE MECHANISM.